It got the Riddler. It got the Penguin. It got Deadshot, Hugo Strange, Two-Face, Tweedledee, and Tweedledum. It has left carnage in its wake as it moves through Gotham's villainous underworld, and Batman finds himself vexed by one very important question: Just what on Earth is it? Now the Dark Knight's search for clues has him tracking The Joker. But wouldn't it be funny if the mysterious creature stalking Gotham got to the Clown Prince of Crime first?